This is a fairly visually engaging image - the figure in front stepping out of the yellow space into the blue is possibly the most important part of the photograph. Perfect timing with the foot a little bit into the the blue space! Compositionally, it's very 'heavy' on the right side - the left side is empty except for the line separating the blue and yellow forms. A form on the left side would bring a lot of balance to this composition, but it doesn't have to be large - even a penny on the ground would drastically change the compositional structure.

I agree with Yifkong that cropping this image may improve it - you could probably cut the image in half, leaving just the right side, and it would still be visually interesting. You won't know until you try! However, I'm not distracted by the exposure, even though there aren't any bright highlights. The black pants on the edge of the frame on the right side balance pretty well with the bright yellows on the other side. It's no Ansel Adams print, but technically precise exposure isn't the only important thing in photography. Don't get me wrong, it's something that photographers should be constantly trying to improve on throughout their lives, but sometimes you have to choose your battles. :)

A good way to practice composition is to walk around a city block and try to make as many pictures possible that are spatially flat as can be. This forces you to throw depth out of the window and focus on lines, forms, and shapes. Don't be afraid to break the rule of thirds. Researching the golden rectangle/ratio/spiral might also get your creative juices flowing. Get a photo book from the library too, and take detailed notes on what you look at in the photographs, sequentially and shape-by-shape. A lot of photographers/artists feel like they're stealing when they try to imitate other works of art - don't be afraid to do this. You can learn a lot about yourself and your own style from trying to mimic photographers and artists that you admire. It can be very helpful in developing your own style.

No problem! Me personally? Probably not. But that's because I've never felt an affinity with color photography, so I'm probably not the right guy to ask! "Reasonable" is also a very relative term - I could see an 8x10 print of this going for around 10 or 20 $, without mounting. I'd consider it above par for most of the shabby coffee shop prints you see around. It's minimalist too, so I bet if it caught the eye of someone who appreciates minimalist color street photography, they'd be willing to shell out some dough.

Hmm, interesting. I'm only asking because I was asked to be in a gallery and I have to choose 3 of my images that I think are the best. problem is, I'm way too critical of my own work and I don't know which of my photographs would even be worth a ~$150 tag (~20x30). If you're interested, perhaps you could take a look through my work and maybe pick a few you think would be worth the price?

Edit: For full disclosure, I'm also downright stupid when it comes to prices usually - I've got a tendency to underprice things because I have practically zero experience with art sales, so I'd suggest getting a 2nd opinion as well.